Solution : https://service.sap.com/sap/support/notes/1380510 (SAP Service marketplace login required)
Key words :
terms maintain customer-specific menus, maintain customer-specific menus, customer-specific menus structure, customer-specific menu structure, input view cluster, view cluster vc_grfnmenuc, rubbish data, default content, transaction sm34, vc_grfnmenuc reason
Related Notes :
1378417 | Ability to Customize the Standard Delivered Menu |
1373974 | PC3.0 Support Pack 4 - Master Note |